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Last November, Microsoft released security bulletin MS10-087, which addresses a number of critical vulnerabilities in how Microsoft Office parses various office file formats. One of them is CVE-2010-3333, "RTF Stack Buffer Overflow Vulnerability," which could lead to remote code execution via specially crafted RTF data. A few days before Christmas, we received a new sample (sha1: cc47a73118c51b0d32fd88d48863afb1af7b2578) that reliably exploits this vulnerability and is able to execute malicious shellcode which downloads other malware.